Last time to bother with it, but these folks explicitly worked with tounge and groove, and recommended this to me for my old togunge and groove. It is amazing the different responses one gets from folks that have worked with the stuff for years. The Woodsmith store recommended filling with an epoxy filler. The oldest and biggest wood flooring experts here in Des Moines recommended a latex filler. Another recomended not filling at all and just finisnhing, another the rope, another the ripping of wood strips. I have heard from about 40 people now, and the overwheming majority of wood flooring people said fill with latex, or don't fill, etiher one. Absouletely no one recommnends getting into the re-laying it, several recommend to abosolutly NOT try that! I think I will just leave it alnone and refinish. The only thing I worry about is dust collecting etc.